What's the most annoying two-factor authentication method you've used?

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Time-based authenticators that then trigger you to confirm it is you via email/an additional screen are pretty over the top. Happens to me with Meta occasionally.

Not sure but Customer.io has a nightmare of a login process if you're not the account admin.

Text message codes can be super frustrating, especially when they take forever to arrive or don't come through at all. It's even worse if you're traveling and don't have cell service. I get the security aspect, but it’s a hassle when you just want to log in quickly.